Question about 1997 Jeep Grand Cherokee

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Would not start in the morning. ignition coil,ignition cover, spark plugs and wires, crank sensor, cam sensor, PCM, were replaced.Once it start, run all day without failling.

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  • 252 Answers

Sounds like a fueling problem. Swap the fuel filter, located high up on the firewall in engine bay.

Do you pump the gas pedal before you start it in the morning? There may be an air lock in the system, but pumping it will push fuel forwards.

If that doesn't help, get the injectors checked. They can be professionally pulse cleaned, although weigh up the cost of new injectors compared to the cleaning (I'm guessing you're in the US and I have no idea of inj. cleaning costs).

Good luck!

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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1 Answer

Hello Tom,I had the plugs, wires and coil replaced, but no improvements. Can it be a sensor, or the cam nsor? Im going nuts, and broke.


We all know that feeling, especially the broke part. Stop throwing parts at it. You need a good diagnosis. For "cranks, no start" check fuel pressure and spark. For no spark, use a wiring diagram and understand what is involved. The crank and cam sensors are usually part of the mix. The computer (pcm) uses these sensors to determine spark timing, and often injector timing. Also besides coil, plugs, and wires, and the sensors mentioned, don't forget how the ignition system controls the coils- the ignition control module, or ICM. This little part is often the cause of no spark. But, everything can and should be tested first.

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97 oldsmobile achieva wont fire changed coil pack spark plugs cam sensor still wont start


Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
If you having a problem with more than one system, I want to check for rpm signal, that usually comes from the crank sensor. Not sure why you replaced cam sensor? I always want to check sensor wiring circuits before replacing anything. Don't replace anything unless your testing points in that direction.

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If by your description I'm assuming you say "NO START" you mean it cranks but don't start..? Depending on the YR, make & model Poss. defective module? or switch itself, pickup (if app) Wrong plugs, mass air flow sensor (if app) Any C/E LTS? Scan PCM , also ck coolant system readings & ck emissions when running., crank & cam sensors are popular for that problem along with the module and pickup coil too. It's Long list but I would start with a scan of the PCM & check those crank & cam sensors 1st. Good Luck

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It turns but it wont start,it has gas and power


Pull off the coil ignition cable at the distributor and check for spark coming out of coil when cranking engine over. Use a heavy rag or glove to hold the wire 1/4 inch from a metal ground. Should see a strong blue spark when cranking to verify ignition is good. If no spark, check for battery voltage to coil on the coil primary. If you have current to the coil, suspect a bad coil, ignition module, crank position sensor, or cam position sensor, or pcm. The coil, ignition module, and sensors can be tested before replacing.

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What causes plug wires to fire orange?


The fuel pump has nothing to do with spark,common sense

Why would you listen to anyone-- except an experienced
mechanic at a repair shop?

The computer only grounds the ignition system, to
turn off the ignition coils primary windings & collapse the
secondary field windings, to create the spark at the plugs

You need to know what your doing

You need a good blue spark & also know how much
voltage you have

I suggest you don't check anything your not knowledgeable
on,as you may ruin some module or the pcm through improper
testing methods

The fuel pump only runs 3 seconds if the PCM sees no crank
signal

You can check injector pulse as well as spark

If you keep cycling the ignition key ,you fill the cylinders
with fuel & possibly hydraulic the engine & ruin it

I think a repair shop is in order

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1 Answer

My 1994 cavalier lost spark to cylinders 1 and 4. Which components are directly related to ignition spark and timing? What about the camshaft sensor?


You listed all the components involved in spark timing and control- coil, ignition module, pcm, wires, plugs, crank sensor, and cam sensor.
Cylinders 1 and 4 have the same coil for both, so concentrate on that coil. You still have a good blue spark on cylinders 2 and 3? If you have spark there, I don't know about the cam sensor-I think it would be good if it works at all. You need to check if you have 12 volts power to the coil for 1 and 4.

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This coil is activated by an ignition module triggered by using the camshaft/crankshaft angle sensor; timing is adjusted by the PCM (computer).This primary electrical signal is generated by the PCM which calculates spark timing by using a variety of sensors including coolant temperature, mass air flow, and oxygen sensors. Go to 2carpros.com for a video on how to check this using a 12v light tool. On the engine repair section search, type, "engine cranks but will not start." If my answer helpe you, please leve good feedback. thanks

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